/*
 *
 * $Id: term.dos,v 1.2 1998/02/28 00:15:44 hubert Exp $
 *
 * Program:	IBM PC specific routine
 *
 *
 * Michael Seibel
 * Networks and Distributed Computing
 * Computing and Communications
 * University of Washington
 * Administration Builiding, AG-44
 * Seattle, Washington, 98195, USA
 * Internet: mikes@cac.washington.edu
 *
 * Please address all bugs and comments to "pine-bugs@cac.washington.edu"
 *
 *
 * Pine and Pico are registered trademarks of the University of Washington.
 * No commercial use of these trademarks may be made without prior written
 * permission of the University of Washington.
 * 
 * Pine, Pico, and Pilot software and its included text are Copyright
 * 1989-1998 by the University of Washington.
 * 
 * The full text of our legal notices is contained in the file called
 * CPYRIGHT, included with this distribution.
 *
 */

/*
 * The routines in this file provide support for the IBM-PC and other
 * compatible terminals. It goes directly to the graphics RAM to do
 * screen output. It compiles into nothing if not an IBM-PC driver
 */

#include	<conio.h>
#if     IBMPC
#define	termdef	1			/* don't define "term" external */

int  ibmmove PROTO((int, int));
int  ibmeeol PROTO((void));
int  ibmputc PROTO((int));
int  ibmoutc PROTO((char));
int  ibmeeop PROTO((void));
int  ibmrev PROTO((int));
void beep PROTO((unsigned int, unsigned int));
int  cutebeep PROTO((void));
int  ibmbeep PROTO((void));
int  ibmopen PROTO((void));
int  ibmclose PROTO((void));


#define	MARGIN	8		/* size of minimim margin and	*/
#define	SCRSIZ	64		/* scroll size for extended lines */
#define	MROW	2		/* rows in menu                 */


#define	 SET_COLOR(fore,back)	((((back) & 0xf) << 4) | ((fore) & 0xf))

int	 nfcolor = 7;		/* current forground color */
int	 nbcolor = 1;		/* current background color */
int	 rfcolor = 0;		/* reverse forground color */
int	 rbcolor = 3;		/* reverse background color */
unsigned cattr;			/* current combined attribute */

/*
 * Standard terminal interface dispatch table. Most of the fields point into
 * "termio" code.
 */
TERM    term    = {
        NROW-1,
        NCOL,
	MARGIN,
	SCRSIZ,
	MROW,
        ibmopen,
	NULL,
        ibmclose,
        ttgetc,
	ibmputc,
        ttflush,
        ibmmove,
        ibmeeol,
        ibmeeop,
        ibmbeep,
	ibmrev
};


#ifdef DOS
extern union REGS rg;
static unsigned display_mode;	/*  */
#endif


static char *colist[] = {
	"black",
	"blue",
	"green",
	"cyan",
	"red",
	"magenta",
	"yellow",
	"white",
        "BLACK",
        "BLUE",
        "GREEN",
        "CYAN",
        "RED",
        "MAGENTA",
        "YELLOW",
        "WHITE" };

/*
 * pico_setcolor - given the color name, return the color's value
 */
int
setcolor(s)
char *s;
{
    int i;

    for (i=0; i<16; i++)
      if (!strcmp(colist[i],s))
	return(i);

    return(7);
}


/*
 * pico_XXcolor() - each function sets a particular attribute
 */
pico_nfcolor(s)
char *s;
{
    nfcolor = setcolor(s);
}

pico_nbcolor(s)
char *s;
{
    nbcolor = setcolor(s);
}

pico_rfcolor(s)
char *s;
{
    rfcolor = setcolor(s);
}

pico_rbcolor(s)
char *s;
{
    rbcolor = setcolor(s);
}

#ifdef OS2
static VIOMODEINFO display_mode;
static BYTE *oldscreen =NULL;
static USHORT origRow, origCol;
static USHORT origLen =0;
#ifdef FASTVIO
extern HMOU Mouse_Handle;
extern int mouse_state;
static int was_mouse_state=-1;
static int _moved=0, _line=0, _col=0;
static USHORT usVidbufLength =0;
static USHORT usRows =0, usCols =0;
static USHORT * pusVidBuffer =NULL;
static USHORT fCell=(USHORT)-1,
              lCell=(USHORT)-1;

static HEV  hvUpdate =(HEV)0;
static HMTX hxUpdate =(HMTX)0;
static TID threadID;
static NOPTRRECT noptr = { 0, 0, (USHORT)-1, (USHORT)-1 };

static void update_thread(ULONG args)
{
  while (DosWaitEventSem(hvUpdate, -1)==0) {
    DosResetEventSem(hvUpdate, &args);
    if (fCell!=(USHORT)-1) {
      DosRequestMutexSem(hxUpdate,-1);
      if (was_mouse_state && Mouse_Handle!=(HMOU)-1)
	MouRemovePtr(&noptr, Mouse_Handle);
      /* Update the screen, if required */
      VioShowBuf(fCell*2,(lCell-fCell+1)*2, 0);
      fCell=lCell=(USHORT)-1;
      DosReleaseMutexSem(hxUpdate);
      if (mouse_state && Mouse_Handle!=(HMOU)-1)
	MouDrawPtr(Mouse_Handle);
    }
    else if (mouse_state != was_mouse_state && Mouse_Handle!=(HMOU)-1) {
      if (mouse_state)
	MouDrawPtr(Mouse_Handle);
      else
	MouRemovePtr(&noptr, Mouse_Handle);
    }
    was_mouse_state=mouse_state;
    if (_moved) {
      _moved=0;
      VioSetCurPos((USHORT)_line,(USHORT)_col,0);
    }
    DosSleep(1);
  }
}

static void vidCell(USHORT row, USHORT col)
{
  USHORT cell=(row*usCols)+col;

  DosRequestMutexSem(hxUpdate,-1);
  /* Always update first cell */
  if (fCell==(USHORT)-1)
    fCell=lCell=cell;
  else {
    /* Otherwise stretch limits if necessary */
    if (cell<fCell)
      fCell=cell;
    if (cell>lCell)
      lCell=cell;
  }
  DosReleaseMutexSem(hxUpdate);
}

/* These seek to do minimal screen update
 * by keeping track of the first and last
 * cells written to the video buffer
 */

void vidUpdate()
{
  if (hvUpdate == (HEV)0) {
    VIOMODEINFO mi;

    DosCreateEventSem(NULL, &hvUpdate, 0, FALSE);
    DosCreateMutexSem(NULL, &hxUpdate, 0, FALSE);
    DosCreateThread(&threadID,update_thread,0,0,8192);
    mi.cb = sizeof mi;
    VioGetMode(&mi, 0);
    noptr.cRow = mi.row-1;
    noptr.cCol = mi.col-1;
  }
  DosPostEventSem(hvUpdate);
}

static void vidArea(USHORT frow, USHORT fcol, USHORT lrow, USHORT lcol)
{
  vidCell(frow,fcol);
  vidCell(lrow,lcol);
}
#endif
#endif


/*
 * ibmmove - Use BIOS video services, function 2h to set cursor postion
 */
ibmmove(row, col)
int row, col;
{
#ifdef OS2
#ifdef FASTVIO
  if (_line!=row || _col!=col) {
    _line=row;
    _col=col;
    _moved=1;
  }
#else
  VioSetCurPos((USHORT)row, (USHORT)col, 0);
#endif
#else
    rg.h.ah = 2;		/* set cursor position function code */
    rg.h.bh = 0;		/* set screen page number */
    rg.h.dl = col;
    rg.h.dh = row;
    int86(BIOS_VIDEO, &rg, &rg);
#endif
}


/*
 * ibmeeol - erase to the end of the line
 */
ibmeeol()
{
#ifdef OS2
  USHORT row, col;
  BYTE chattr[2];
  chattr[0] = ' ';
  chattr[1] = (BYTE)cattr;

#ifdef FASTVIO
  row=(USHORT)_line;
  col=(USHORT)_col;
  vidCell(row,col);
  vidCell(row,usCols-1);
  row=(row*usCols)+col;
  col=usCols-col;
  while(col--)
    pusVidBuffer[row++] = *(USHORT *)chattr;
#else
  /* find the current cursor position */
  VioGetCurPos(&row, &col, 0);
  VioWrtNCell(chattr, NCOL-col, row, col, 0);
#endif
#else
    int col, row, page;

    /* find the current cursor position */
    rg.h.ah = 3;		/* read cursor position function code */
    int86(BIOS_VIDEO, &rg, &rg);
    page = rg.h.bh;
    col = rg.h.dl;		/* record current column */
    row = rg.h.dh;		/* and row */

    rg.h.ah = 0x09;		/* write char to screen with new attrs */
    rg.h.al = ' ';
    rg.h.bl = cattr;
    rg.h.bh = page;
    rg.x.cx = NCOL-col;
    int86(BIOS_VIDEO, &rg, &rg);
#endif
}


/*
 * ibmputc - put a character at the current position in the
 *	     current colors
 */
ibmputc(ch)
int ch;
{
#ifdef OS2
  USHORT row, col;

  /* first, get current position */
#ifdef FASTVIO
  row=(USHORT)_line;
  col=(USHORT)_col;
#else
  VioGetCurPos(&row, &col, 0);
#endif
  if (ch == '\b') {
    if (col > 0)
      ibmmove(row, --col);
  }
  else {
    BYTE chattr[2];
    chattr[0]=(BYTE)ch;
    chattr[1]=(BYTE)cattr;
#if FASTVIO
    vidCell(row,col);
    pusVidBuffer[(row*usCols)+col] = *(USHORT *)chattr;
    if (col < usCols)
#else
      VioWrtNCell(chattr, 1, row, col, 0);
    if (col < NCOL)
#endif
      ibmmove(row, ++col);
  }
#else
    int col, row, page;

    rg.h.ah = 0x03;			/* first, get current position */
    int86(BIOS_VIDEO, &rg, &rg);
    page = rg.h.bh;
    row = rg.h.dh;
    col = rg.h.dl;
    
    if(ch == '\b'){
	if(col > 0)		/* advance the cursor */
	  ibmmove(row, --col);
    }
    else{
	rg.h.ah = 0x09;		/* write char to screen with new attrs */
	rg.h.al = ch;
	rg.h.bl = cattr;		/* inverting if needed */
	rg.h.bh = page;
	rg.x.cx = 1;		/* only once */
	int86(BIOS_VIDEO, &rg, &rg);

	if(col < 80)		/* advance the cursor */
	  ibmmove(row, ++col);
    }
#endif
}


/* 
 * ibmgetc - output a single character with the right attributes, but
 *           don't advance the cursor
 */
ibmgetc(c)
char *c;
{
#ifdef OS2
  /* first, get current position */
#if FASTVIO
  *c=(BYTE)pusVidBuffer[(_line*usCols)+_col];
#else
  USHORT row, col, n = 1;

  VioGetCurPos(&row, &col, 0);
  VioReadCharStr(c, 1, &n, row, col, 0);
#endif
#else
    rg.h.ah = 8;			/* vid services, read char at cursor */
    rg.h.bh = 0;
    int86(0x10, &rg, &rg);
    *c = rg.h.al;
#endif
}


/*
 * ibmeeop - clear from cursor to end of page
 */
ibmeeop()
{
#ifdef OS2
#if FASTVIO
  USHORT atofs;
#endif
  BYTE chattr[2];
  chattr[0] = ' ';
  chattr[1] = (BYTE)cattr;

#ifdef FASTVIO
  vidArea(0,0,usRows-1,usCols-1);
  for (atofs=0; atofs < usVidbufLength;++atofs)
	pusVidBuffer[atofs] = *(USHORT *)chattr;
#else
  VioScrollUp(0, 0, -1, -1, -1, chattr, 0);
#endif
#else
    rg.h.ah = 6;		/* scroll page up function code */
    rg.h.al = 0;		/* # lines to scroll (clear it) */
    rg.x.cx = 0;		/* upper left corner of scroll */
    rg.x.dx = (term.t_nrow << 8) | (term.t_ncol - 1);
    rg.h.bh = cattr;
    int86(BIOS_VIDEO, &rg, &rg);
#endif
    ibmmove(0, 0);
}


/*
 * ibmrev - change reverse video state
 */
ibmrev(state)
int state;
{
    cattr = (state) ? SET_COLOR(rfcolor, rbcolor)
		    : SET_COLOR(nfcolor, nbcolor);
}


/*
 * getrevstate - return the current reverse state
 */
getrevstate()
{
    return(cattr == SET_COLOR(rfcolor, rbcolor));
}


/* 
 * beep - make the speaker sing!
 */
void
beep(freq, dur)
unsigned freq, dur;
{
#ifdef OS2
  if (freq)
	DosBeep(freq, dur);
#else
    unsigned oport;

    if(!freq)
	return;

    freq = (unsigned)(1193180 / freq);
    /* set up the timer */
    outp(0x43, 0xb6);			/* set timer channel 2 registers */
    outp(0x42, (0xff&freq));		/* low order byte of count */
    outp(0x42, (freq>>8));		/* hi order byte of count */

    /* make the sound */
    oport = inp(0x61);
    outp(0x61, oport | 0x03);
    ssleep((clock_t)((dur < 75) ? 75 : dur));
    outp(0x61, oport);
#endif
}


/*
 * cutebeep - make the speeker sing the way we want!
 */
cutebeep()
{
    beep(575, 50);
#ifndef OS2
    ssleep((clock_t)25);
#endif
    beep(485, 90);
}


/*
 * ibmbeep - system beep...
 */
ibmbeep()
{
    cutebeep();
}


/*
 * enter_text_mode - get current video mode, saving to be restored 
 *                   later, then explicitly set 80 col text mode.
 *
 *     NOTE: this gets kind of weird.  Both pine and pico call this
 *           during initialization.  To make sure it's only invoked once
 *           it only responds if passed NULL which pico only does if not
 *           called from in pine, and pine does all the time.  make sense?
 *           thought not.
 */
void
enter_text_mode(p)
PICO *p;
{
#ifdef OS2
    if (!p) {
#ifdef FASTVIO
	ULONG pBuf;
#endif
	display_mode.cb = sizeof display_mode;
	VioGetMode(&display_mode, 0);
	term.t_ncol = display_mode.col;
	term.t_nrow = display_mode.row - 1;
	origLen = display_mode.row * display_mode.col * sizeof(USHORT);
	if (oldscreen)
	  free(oldscreen);
	oldscreen = malloc(origLen);
	if (oldscreen)
	  VioReadCellStr(oldscreen, &origLen, 0, 0, 0);
	VioGetCurPos(&origRow, &origCol, 0);
#ifdef FASTVIO
	_line=origRow;
	_col=origCol;
#endif
#ifdef FASTVIO
	usRows = display_mode.row;
	usCols = display_mode.col;
	VioGetBuf(&pBuf,&usVidbufLength,0);
	pusVidBuffer = _emx_16to32((_far16ptr)pBuf);
	/* OS2 2.1+ VIO bug (viobuf not initialised) workaround */
	memcpy(pusVidBuffer,oldscreen,usVidbufLength);
	usVidbufLength /= 2;  /* Cells, not bytes */
#endif
    }
#else
    static int i = 0;
    if(!p && !i++){
	rg.h.ah = 0x0f;			/* save old mode */
	int86(BIOS_VIDEO, &rg, &rg);
	display_mode = rg.h.al;

	rg.h.ah = 0;			/* then set text mode */
	rg.h.al = 2;
	int86(BIOS_VIDEO, &rg, &rg);		/* video services */
    }
#endif
}


/*
 * exit_text_mode - leave text mode by restoring saved original 
 *                  video mode.
 */
void
exit_text_mode(p)
PICO *p;
{

#ifdef OS2
    if (!p) {
    	turnmouseoff(); /* Make sure mouse is off while display is updated */
	VioSetMode(&display_mode, 0);
	if (!oldscreen)
	{
	  ibmeeop();
	  VioSetCurPos(display_mode.row-1, 0, 0);
	}
	else
	{
	  VioWrtCellStr(oldscreen, origLen, 0, 0, 0);
	  VioSetCurPos(origRow, origCol, 0);
	}
    }
#else
    static int i = 0;
    if(!p && !i++){			/* called many, invoke once! */
	rg.h.ah = 0;			/* just restore old mode */
	rg.h.al = display_mode;
	int86(BIOS_VIDEO, &rg, &rg);
    }
#endif
}


/*
 * ibmopen - setup text mode and setup key labels...
 */
ibmopen()
{

    enter_text_mode(Pmaster);

    cattr    = SET_COLOR(nfcolor, nbcolor);
    revexist = TRUE;
    inschar  = delchar = 0;

    ttopen();
}


ibmclose()
{
#if	COLOR
    ibmfcol(7);
    ibmbcol(0);
#endif
#ifdef MOUSE
    mouseoff();
#endif
    exit_text_mode(Pmaster);

    ttclose();
}
#endif